lnadai

Hi friends,
I would like to re-phrase my earlier question to make it clearer.
What I want is this:
If I use the link:
http://mywpsite.com?hideit=1
Then I would like to see only the pape, no sidebar, no header, nothing else.
Otherwise I want to see my “regular” WP site.
While google-ing, I sound that I can parse the parameter “show” with something like this:

if (isset($_GET['hideit'])) {
  $hideit = $_GET['hideit'];
} else {
  //Maybe I don't need anything here
}

I have also seen thing like:
.header {display:none;}
and similar.
Unfortunately I don’t know php / wp well enough to find the proper places for getting the “hideit” parameter, and and where to use the $hideit variable so it would conditionally hide the parts.

Please be kind enough and tell me if this is really as easy as I think.
TIA